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JP3995526B2 - High pressure fuel injection pipe with connecting head - Google Patents

High pressure fuel injection pipe with connecting head Download PDF

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Publication number
JP3995526B2
JP3995526B2 JP2002144887A JP2002144887A JP3995526B2 JP 3995526 B2 JP3995526 B2 JP 3995526B2 JP 2002144887 A JP2002144887 A JP 2002144887A JP 2002144887 A JP2002144887 A JP 2002144887A JP 3995526 B2 JP3995526 B2 JP 3995526B2
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JP
Japan
Prior art keywords
point
annular
head
fuel injection
pressure fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP2002144887A
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Japanese (ja)
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JP2003336560A (en
Inventor
宗勝 古堅
重行 石田
信夫 加藤
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Usui Co Ltd
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Usui Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Usui Co Ltd filed Critical Usui Co Ltd
Priority to JP2002144887A priority Critical patent/JP3995526B2/en
Priority to US10/439,830 priority patent/US6840283B2/en
Priority to DE10322442A priority patent/DE10322442A1/en
Priority to FR0306042A priority patent/FR2839751B1/en
Priority to KR10-2003-0031933A priority patent/KR100474768B1/en
Priority to CNB031409873A priority patent/CN1261685C/en
Publication of JP2003336560A publication Critical patent/JP2003336560A/en
Application granted granted Critical
Publication of JP3995526B2 publication Critical patent/JP3995526B2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
    • F16L19/028—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall
    • F16L19/0283—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall and having a bell-mouthed shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Joints With Pressure Members (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、例えばディーゼル内燃機関における燃料の供給路などとして配設多用される管径４ｍ／ｍ乃至２０ｍ／ｍ、肉厚１ｍ／ｍ乃至８ｍ／ｍ程度の比較的細径からなる厚肉鋼管による接続頭部を有する高圧燃料噴射管に関するものである。
【０００２】
【従来の技術】
従来、この種の接続頭部を有する高圧燃料噴射管としては、図４に例示するように、比較的細径からなる厚肉鋼管１１の接続端部に、球面状のシート面１３と、該シート面１３から軸芯方向に間隔をおいて設けた環状フランジ部１５と、前記シート面１３に連なって前記環状フランジ部１５まで先端に向って先細りとなる円錐面１４とから形成された接続頭部１２を有するものが知られている（特開平８−７５０７５公報参照）。この種の接続頭部１２は、外方からのパンチ部材による軸芯方向への押圧による挫屈加工によって成形されるのに関連して、該押圧による挫屈加工に伴う周壁の外側への拡がりによって、該頭部内周面に深くて鋭くかつ大きな環状のポケット１６を生ぜしめて構成され、かかる状態で使用に供されている現状にある。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような従来の接続頭部を有する高圧燃料噴射管は、前記頭部内側に生ずる深くて鋭くかつ大きな環状のポケットによって、配設使用時の高圧流体に起因して該ポケット部にキャビテーションエロージョンを生ぜしめるという問題と、該ポケット部の最深部が疲労破壊の起点となる可能性があるという問題があった。
【０００４】
本発明は前記従来技術の有する前記問題点に鑑みてなされたもので、頭部加工に伴い頭部内部に生じる環状のポケットを浅くかつなだらかな断面の輪郭形状とすることができ、したがって該頭部内側でのキャビテーションエロージョンによる憂いと疲労破壊の危惧をなくすことができる接続頭部を有する高圧燃料噴射管を提供することを目的とするものである。
【０００５】
【課題を解決するための手段】
本発明は上記目的を達成するため、比較的細径からなる厚肉鋼管の接続端部に、球面状のシート面と、該シート面から軸芯方向に間隔をおいて設けた環状フランジ部と、前記シート面に連なって前記環状フランジ部まで先端に向って先細りとなる円錐面とから形成された接続頭部を有する高圧燃料噴射管において、前記円錐面の一部に深さの浅い環状の湾曲凹溝を設けることによって、該接続頭部の成形に伴って生ずる該頭部内側の環状凹溝を深さが浅くかつなだらかな断面の輪郭形状となした接続頭部を有する高圧燃料噴射管を要旨とするものである。
また、前記円錐面の一部に設ける環状の湾曲凹溝は、該接続頭部の環状フランジ部よりシート面側に設けるとともに、該接続頭部の断面形状において、該湾曲凹溝の環状フランジ部側端縁をＡ１点、同フランジ部反対側端縁をＡ２点、管外径をｄ、Ａ２点外径をＤA とした場合に、ＤA ／ｄ＝０．９５〜１．３、好ましくは１．０〜１．２５と、Ａ１点ーＡ２点間の湾曲凹溝の管径方向凹み深さ≧ＤA の条件を満足することを特徴とし、さらに、球面状シート面端縁とＡ１点までの長さをＬ、Ａ１点ーＡ２点間の管軸と平行する長さ（湾曲凹溝の幅）をＷとした場合に、Ｗ／Ｌ＝０．３〜０．７５、好ましくは０．３５〜０．７の条件を満足することを特徴とするものである。
【０００６】
すなわち、本発明では、接続頭部の円錐面の一部に深さの浅い環状の湾曲凹溝を設けることにより、予め成形パンチ側に設けた前記湾曲凹溝に嵌合する凸状の湾曲面の押圧作用により接続頭部の円錐面の一部が拘束され、挫屈成形で生じる該頭部内側の環状凹溝部（ポケット）を深さが浅くかつなだらかとすることができることとなり、該頭部内部での流体圧によるキャビテーションエロージョンの憂いをなくし、かつ応力集中による疲労破壊の起点となる可能性を減少させることができる。
【０００７】
本発明において、Ａ１点ーＡ２点間の管軸と平行する長さ（湾曲凹溝の幅）Ｗと球面状シート面端縁とＡ１点までの長さＬとの比を０．３〜０．７５（好ましくは０．３５〜０．７）と限定したのは、０．３未満ではＡ２点が反対にＡ１点側に寄り過ぎて環状の湾曲凹溝部（Ａ１点ーＡ２点間）が減少して、ポケット部の内面深さを浅くする効果が小さく、他方、０．７５を超えるとＡ２点が接続当部先端側に寄り過ぎて相手金具との接触シール面の確保が困難となるとともに、当部先端付近の剛性が低下して変形し易くなるためである。
また、ＤA ／ｄを０．９５〜１．３（好ましくは１．０〜１．２５）と限定したのは、０．９５未満では、Ａ２点が接続頭部先端側に寄り過ぎて相手金具との接触シール面の確保が困難となり、他方、１．３を超えると、Ａ２点が反対にＡ１点側に寄り過ぎて環状の湾曲凹溝部（Ａ１点〜Ａ２点）が減少して、ポケット部の内面凹み深さを浅くする効果が小さくなるためである。
さらに、湾曲凹溝の頭部先端側管径方向凹み深さをＤA 以上としたのは、パンチによる当部成形時のアンダーカット部をなくすためである。すなわち、湾曲凹溝の頭部先端側管径方向凹み深さをＤA （Ａ２点位置）より小径位置に設けるとアンダーカット部がつくられることにより、接続頭部のパンチによる成形ができなくなるためである。
【０００８】
【発明の実施の形態】
図１は本発明に係る高圧燃料噴射管の接続頭部の一実施例を示す側面図、図２は同上接続頭部の縦断半截図、図３は同上接続頭部の成形方法に係る加工工程を示す縦断面による説明図であり、１は厚肉鋼管、２は接続頭部、３は球面状のシート面、４は円錐面、５は環状フランジ部、６はポケット、７はチャック、８はパンチ部材である。
【０００９】
厚肉鋼管１は、予め定寸に切断された高圧配管用炭素鋼鋼材よりなる管径４ｍ／ｍ乃至２０ｍ／ｍ、肉厚１ｍ／ｍ乃至８ｍ／ｍ程度の比較的細径厚肉管からなる。
【００１０】
図１、図２に示す高圧燃料噴射管は、厚肉鋼管１の接続端部に、外側周面を相手座部への球面状のシート面３と、該シート３面から軸芯方向に間隔をおいて設けた環状フランジ部５と、前記シート面に連なって前記環状フランジ部５まで先端に向って先細りとなる円錐面４と、前記円錐面４の一部に深さの浅い環状の湾曲凹溝４−１とから構成され、かつ該厚肉鋼管１の内部に深さが浅くかつなだらかとなした環状凹溝１−１が設けられた接続頭部２を有している。
【００１１】
上記の接続頭部２において、円錐面４の一部に設ける環状の湾曲凹溝４−１は、該接続頭部の環状フランジ部５よりシート面３側に設ける。この湾曲凹溝４−１は、当該接続頭部の断面形状において、該湾曲凹溝４−１の環状フランジ部５側端縁をＡ１点、同フランジ部反対側端縁をＡ２点、管外径をｄ、Ａ２点外径をＤA 、Ａ１点ーＡ２点間の管軸と平行する長さ（湾曲凹溝の幅）をＷ、球面状シート面端縁とＡ１点までの長さをＬとした場合に、Ａ１点ーＡ２点間の管軸と平行する長さ（湾曲凹溝の幅）Ｗ／Ｌ＝０．３〜０．７５、ＤA ／ｄ＝０．９５〜１．３、湾曲凹溝の頭部先端側管径方向凹み位置≧ＤA とする。なお、シート面角度θとしては、２５度〜３０度程度である。
【００１２】
次に、図１、図２に示す高圧燃料噴射管の頭部成形方法を図３に基づいて説明すると、本発明ではパンチ部材８として、接続頭部２の球面状のシート面３、円錐面４、湾曲凹溝４−１および環状フランジ部５のそれぞれに対応する球面８−１、円錐面８−２、凸状の湾曲部８−３およびフラット部８−４を形成したものを用いる。
【００１３】
成形に際しては、厚肉鋼管１をチャック７に保持した状態で当該鋼管１の先端部を前記パンチ部材８により軸芯方向へ押圧すると、厚肉鋼管１の頭部加工代の部分が塑性流動し、厚肉鋼管１の先端部に、外側周面を相手座部への球面状のシート面３と、該シート３面から軸芯方向に間隔をおいて設けた環状フランジ部５と、前記シート面に連なって前記環状フランジ部５まで先端に向って先細りとなる円錐面４と、前記円錐面４の一部に深さの浅い環状の湾曲凹溝４−１とから構成され、かつ該厚肉鋼管１の内部に深さが浅くかつなだらかとなした環状凹溝１−１が設けられた接続頭部２を有する接続頭部２が得られる。
【００１４】
【発明の効果】
以上説明したごとく、本発明による接続頭部を有する高圧燃料噴射管は、接続頭部の円錐面の一部に深さの浅い環状の湾曲凹溝を設けることにより、成形パンチ側に設けた前記湾曲凹溝に嵌合する凸状の湾曲面の作用により接続頭部の円錐面の一部が拘束され、挫屈成形で生じる該頭部内側の環状凹溝部（ポケット）を深さが浅くかつなだらかな断面の輪郭形状を有するものとすることができることとなり、該頭部内部での流体圧によるキャビテーションエロージョンの憂いをなくし、さらに疲労破壊の起点となる可能性も大幅に減少するという優れた効果を奏する。
【図面の簡単な説明】
【図１】本発明に係る高圧燃料噴射管の接続頭部の一実施例を示す側面図である。
【図２】同上接続頭部の縦断半截図である。
【図３】同上接続頭部の成形方法に係る加工工程を示す縦断面による説明図である。
【図４】本発明の対象とする従来の高圧燃料噴射管の接続頭部の一例を示す断面図である。
【符号の説明】
１ 厚肉鋼管
２ 接続頭部
３ 球面状のシート面
４ 円錐面
５ 環状フランジ部
６ ポケット
７ チャック
８ パンチ部材[0001]
BACKGROUND OF THE INVENTION
The present invention is a thick steel pipe having a relatively small diameter of about 4 m / m to 20 m / m and a thickness of about 1 m / m to 8 m / m, which is frequently used as a fuel supply path in a diesel internal combustion engine, for example. This relates to a high-pressure fuel injection pipe having a connection head.
[0002]
[Prior art]
Conventionally, as a high-pressure fuel injection pipe having this type of connection head, as illustrated in FIG. 4, a spherical sheet surface 13, A connection head formed by an annular flange portion 15 provided at an interval in the axial direction from the seat surface 13 and a conical surface 14 that continues to the seat surface 13 and tapers toward the tip to the annular flange portion 15. One having a portion 12 is known (see JP-A-8-75075). This type of connection head 12 is formed by the buckling process by pressing in the axial direction by the punch member from the outside, and spreads to the outside of the peripheral wall due to the buckling process by the pressing. Thus, a deep, sharp and large annular pocket 16 is formed on the inner peripheral surface of the head, and is used in such a state.
[0003]
[Problems to be solved by the invention]
However, such a conventional high-pressure fuel injection pipe having a connecting head has a deep, sharp and large annular pocket formed inside the head, which causes cavitation in the pocket due to the high-pressure fluid during use. There was a problem of causing erosion and a problem that the deepest portion of the pocket portion may become a starting point of fatigue fracture.
[0004]
The present invention has been made in view of the above-described problems of the prior art, and an annular pocket generated inside the head as a result of head processing can be formed into a shallow and gentle profile of the cross section. An object of the present invention is to provide a high-pressure fuel injection pipe having a connection head that can eliminate the fear of cavitation erosion inside the unit and the fear of fatigue destruction.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a spherical sheet surface at a connection end of a thick steel pipe having a relatively small diameter, and an annular flange provided at an interval in the axial direction from the sheet surface. In the high-pressure fuel injection pipe having a connecting head formed from a conical surface that is continuous with the seat surface and tapers toward the tip to the annular flange portion, a part of the conical surface has a shallow annular shape. A high-pressure fuel injection pipe having a connecting head in which an annular concave groove formed inside the head is formed with a curved concave groove and has a shallow cross-sectional profile with a shallow depth. Is the gist.
Further, the annular curved groove provided in a part of the conical surface is provided on the seat surface side from the annular flange portion of the connection head, and the annular flange portion of the curved groove in the cross-sectional shape of the connection head DA / d = 0.95 to 1.3, preferably 1 when the side edge is A1, the opposite edge of the flange is A2, the pipe outer diameter is d, and the A2 point outer diameter is DA. 0 to 1.25, and satisfies the condition of the depth of the radial groove of the curved groove between the points A1 and A2 ≧ DA, and further, the spherical sheet surface edge and the point A1 W / L = 0.3 to 0.75, preferably 0.35, where L is the length and W is the length parallel to the tube axis between point A1 and point A2 (width of the curved groove). It satisfies the condition of -0.7.
[0006]
That is, in the present invention, a convex curved surface that is fitted in the curved concave groove provided on the molding punch side in advance by providing a shallow curved concave groove on a part of the conical surface of the connecting head. A part of the conical surface of the connecting head is constrained by the pressing action, and the annular concave groove (pocket) inside the head generated by the buckling can be made shallow and gentle. The fear of cavitation erosion due to internal fluid pressure can be eliminated, and the possibility of starting fatigue failure due to stress concentration can be reduced.
[0007]
In the present invention, the ratio of the length (width of the curved groove) W parallel to the tube axis between point A1 and point A2 to the length L of the spherical sheet surface edge to the point A1 is 0.3-0. .75 (preferably 0.35 to 0.7) is limited to less than 0.3 because the A2 point is too close to the A1 side and the annular curved groove (between A1 and A2) is formed. The effect of reducing the depth of the inner surface of the pocket portion is small, and on the other hand, if it exceeds 0.75, the point A2 is too close to the distal end side of the connection contact portion, and it becomes difficult to secure a contact seal surface with the mating bracket. At the same time, the rigidity in the vicinity of the tip of this part is lowered, and it becomes easy to deform.
Further, the reason that DA / d is limited to 0.95 to 1.3 (preferably 1.0 to 1.25) is that if it is less than 0.95, the point A2 is too close to the tip of the connecting head, and the mating metal On the other hand, when it exceeds 1.3, the point A2 is too close to the point A1 and the annular curved groove (A1 to A2 points) decreases, and the pocket This is because the effect of reducing the depth of the inner surface recess of the portion is reduced.
Further, the reason why the depth of the head-end-side tube radial direction of the curved concave groove is set to DA or more is to eliminate an undercut portion at the time of forming the portion by punching. That is, if the concave depth of the head end side of the curved concave groove is provided at a position smaller in diameter than DA (point A2), an undercut portion is formed, so that the connecting head cannot be formed by punching. is there.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view showing an embodiment of a connection head of a high-pressure fuel injection pipe according to the present invention, FIG. 2 is a vertical half-sectional view of the connection head of the same, and FIG. 1 is a thick steel pipe, 2 is a connection head, 3 is a spherical seat surface, 4 is a conical surface, 5 is an annular flange, 6 is a pocket, 7 is a chuck, 8 Is a punch member.
[0009]
The thick-walled steel pipe 1 is a relatively small-diameter thick-walled pipe having a pipe diameter of 4 m / m to 20 m / m and a wall thickness of about 1 m / m to 8 m / m made of a carbon steel material for high-pressure piping that has been cut to a predetermined size. Become.
[0010]
The high-pressure fuel injection pipe shown in FIGS. 1 and 2 has a spherical seat surface 3 with an outer peripheral surface facing the mating seat at the connection end of the thick steel pipe 1, and a distance from the surface of the seat 3 in the axial direction. An annular flange portion 5 provided at a gap, a conical surface 4 that is continuous with the seat surface and tapers toward the tip to the annular flange portion 5, and an annular curve having a shallow depth at a part of the conical surface 4. The connection head 2 is provided with an annular groove 1-1 that is formed of a groove 4-1 and has a shallow depth inside the thick steel pipe 1.
[0011]
In the connection head 2 described above, the annular curved groove 4-1 provided in a part of the conical surface 4 is provided on the seat surface 3 side from the annular flange portion 5 of the connection head. The curved concave groove 4-1 has, in the cross-sectional shape of the connecting head, the edge of the curved concave groove 4-1 on the annular flange portion 5 side at point A1, the opposite edge of the flange portion at point A2, and the outside of the tube. The diameter is d, the A2 point outer diameter is DA, the length parallel to the tube axis between the points A1 and A2 (the width of the curved groove) is W, and the length from the spherical sheet surface edge to the point A1 is L. In this case, the length parallel to the tube axis between point A1 and point A2 (width of the curved groove) W / L = 0.3 to 0.75, DA / d = 0.95 to 1.3, It is assumed that the head end side tube-side dent position of the curved groove is ≧ DA. The sheet surface angle θ is about 25 degrees to 30 degrees.
[0012]
Next, a method for forming the head portion of the high-pressure fuel injection pipe shown in FIGS. 1 and 2 will be described with reference to FIG. 3. In the present invention, the punch member 8 is used as the spherical sheet surface 3 and conical surface of the connection head portion 2. 4, what formed the spherical surface 8-1, the conical surface 8-2, the convex curved part 8-3, and the flat part 8-4 corresponding to each of the curved concave groove 4-1 and the annular flange part 5 is used.
[0013]
In forming, when the thick steel pipe 1 is held by the chuck 7 and the tip of the steel pipe 1 is pressed in the axial direction by the punch member 8, the head machining allowance portion of the thick steel pipe 1 is plastically flowed. A spherical sheet surface 3 having an outer peripheral surface facing the mating seat at the tip of the thick steel pipe 1, an annular flange portion 5 provided at an interval in the axial direction from the surface of the sheet 3, and the sheet The conical surface 4 that is continuous with the surface and tapers toward the tip of the annular flange portion 5, and the annular curved concave groove 4-1 having a shallow depth in a part of the conical surface 4, and has the thickness A connection head 2 having a connection head 2 provided with an annular concave groove 1-1 having a shallow depth inside the meat steel pipe 1 is obtained.
[0014]
【The invention's effect】
As described above, the high-pressure fuel injection pipe having the connection head according to the present invention is provided with the shallow curved concave groove in the conical surface of the connection head, thereby providing the above-described high pressure fuel injection pipe on the molding punch side. A part of the conical surface of the connecting head is constrained by the action of the convex curved surface that fits into the curved concave groove, and the depth of the annular concave groove (pocket) inside the head generated by buckling is reduced. An excellent effect of having a gentle cross-sectional profile, eliminating the fear of cavitation erosion due to fluid pressure inside the head, and greatly reducing the possibility of starting fatigue failure Play.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a connection head of a high-pressure fuel injection pipe according to the present invention.
FIG. 2 is a vertical half-sectional view of the connecting head of the above.
FIG. 3 is an explanatory view with a longitudinal section showing a processing step according to the method of forming the connection head portion.
FIG. 4 is a cross-sectional view showing an example of a connection head of a conventional high-pressure fuel injection pipe that is a subject of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Thick steel pipe 2 Connection head 3 Spherical sheet surface 4 Conical surface 5 Annular flange part 6 Pocket 7 Chuck 8 Punch member

Claims (3)

比較的細径からなる厚肉鋼管の接続端部に、球面状のシート面と、該シート面から軸芯方向に間隔をおいて設けた環状フランジ部と、前記シート面に連なって前記環状フランジ部まで先端に向って先細りとなる円錐面とから形成された接続頭部を有する高圧燃料噴射管において、前記円錐面の一部に深さの浅い環状の湾曲凹溝を設けることによって、該接続頭部の成形に伴って生ずる該頭部内側の環状凹溝を深さが浅くかつなだらかな断面の輪郭形状となしたことを特徴とする接続頭部を有する高圧燃料噴射管。A connection surface of a thick steel pipe having a relatively small diameter has a spherical sheet surface, an annular flange provided at a distance from the sheet surface in the axial direction, and the annular flange connected to the sheet surface. In a high-pressure fuel injection pipe having a connection head formed from a conical surface that tapers toward the tip, the connection is provided by providing an annular curved concave groove having a shallow depth in a part of the conical surface. A high-pressure fuel injection pipe having a connecting head, wherein an annular groove formed inside the head is formed in a shape of a shallow cross section with a shallow depth. 前記円錐面の一部に設ける環状の湾曲凹溝は、該接続頭部の環状フランジ部よりシート面側に設けるとともに、該接続頭部の断面形状において、該湾曲凹溝の環状フランジ部側端縁をＡ１点、同フランジ部反対側端縁をＡ２点、管外径をｄ、Ａ２点外径をＤA とした場合に、下記条件を満足することを特徴とする請求項１記載の接続頭部を有する高圧燃料噴射管。
記
ＤA ／ｄ＝０．９５〜１．３
Ａ１点ーＡ２点間の湾曲凹溝の管径方向凹み深さ≧ＤAThe annular curved groove provided in a part of the conical surface is provided on the seat surface side from the annular flange portion of the connection head, and in the cross-sectional shape of the connection head, the end of the curved groove on the annular flange portion side 2. The connecting head according to claim 1, wherein the following conditions are satisfied when the edge is A1, the opposite edge of the flange portion is A2, the pipe outer diameter is d, and the A2 outer diameter is DA. A high pressure fuel injection pipe having a section.
DA / d = 0.95-1.3
Depth of dent in the radial direction of the curved groove between points A1 and A2 ≧ DA 前記円錐面の一部に設ける環状の湾曲凹溝は、該接続頭部の環状フランジ部よりシート面側に設けるとともに、該接続頭部の断面形状において、該湾曲凹溝の環状フランジ部側端縁をＡ１点、同フランジ部反対側端縁をＡ２点、球面状シート面端縁とＡ１点までの長さをＬ、Ａ１点ーＡ２点間の管軸と平行する長さ（湾曲凹溝の幅）をＷとした場合に、Ｗ／Ｌ＝０．３〜０．７の条件を満足することを特徴とする請求項１記載の接続頭部を有する高圧燃料噴射管。The annular curved groove provided in a part of the conical surface is provided on the seat surface side from the annular flange portion of the connection head, and in the cross-sectional shape of the connection head, the end of the curved groove on the annular flange portion side Edge is point A1, flange edge opposite edge is point A2, point between spherical sheet surface edge and point A1 is L, length parallel to tube axis between point A1 and point A2 (curved groove) The high-pressure fuel injection pipe having a connection head according to claim 1, wherein the condition of W / L = 0.3 to 0.7 is satisfied, where W is a width of (1).
JP2002144887A 2002-05-20 2002-05-20 High pressure fuel injection pipe with connecting head Expired - Fee Related JP3995526B2 (en)

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JP2002144887A JP3995526B2 (en) 2002-05-20 2002-05-20 High pressure fuel injection pipe with connecting head
US10/439,830 US6840283B2 (en) 2002-05-20 2003-05-16 High-pressure fuel injection pipe having connecting head portion
DE10322442A DE10322442A1 (en) 2002-05-20 2003-05-19 High pressure fuel injection pipe with a connecting head part
FR0306042A FR2839751B1 (en) 2002-05-20 2003-05-20 HIGH PRESSURE FUEL INJECTION PIPING HAVING PART FORMING CONNECTING HEAD
KR10-2003-0031933A KR100474768B1 (en) 2002-05-20 2003-05-20 High-pressure fuel injection pipe having connecting head portion
CNB031409873A CN1261685C (en) 2002-05-20 2003-05-20 High pressure fuel spraying pipe with connection head

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JP2002144887A JP3995526B2 (en) 2002-05-20 2002-05-20 High pressure fuel injection pipe with connecting head

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JP2003336560A JP2003336560A (en) 2003-11-28
JP3995526B2 true JP3995526B2 (en) 2007-10-24

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FR2839751A1 (en) 2003-11-21
FR2839751B1 (en) 2010-11-05
CN1261685C (en) 2006-06-28
CN1460793A (en) 2003-12-10
JP2003336560A (en) 2003-11-28
DE10322442A1 (en) 2004-01-22
US6840283B2 (en) 2005-01-11
US20030230349A1 (en) 2003-12-18
KR20030090539A (en) 2003-11-28
KR100474768B1 (en) 2005-03-09

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